Vimmerby's winter is long and cold, with temperatures often dropping below -20°C in January and February. Spring brings a slow warming trend, with March averaging around 3°C and April hovering just above freezing. Summer months are mild, with July being the warmest at an average of 19°C, but temperatures can still fluctuate significantly. Autumn is cool and unpredictable, with October seeing temperatures drop back down to near-freezing levels. The coldest winter months often see temperatures as low as -26°C, while summer highs rarely exceed 33°C.